An amino acid molecule includes a central carbon atom bonded to a carboxyl group, and a hydrogen atom.

a nucleic acid and an r group
an amino group and an r group
an amino group and three fatty acids
an amino group and a nucleic acid

an amino group and an R group

"Each of the 20 amino acids has a central carbon atom with four covalent bonds. These bonds link the carbon atom to an amino group ( NH2 ), a carboxyl group ( COOH ), a hydrogen atom, and an R group. The R group can be a carbon side chain, a hydrogen atom, or a functional group. " from my textbook

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An amino group and an R group

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indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.